Headline is wrong. Correct topic sentence from article :
"In essence, by utilizing an improved experimental procedure,
the team managed to mitigate some of the errors from
prior tests — yet still found signals of unexplained
thrust."
No, the EmDrive does not work, they just haven't yet figured out yet why they see the spurious acceleration in their measurements.
How do we know it doesn't work? Because it violates conservation of momentum, without involving any of the extreme conditions where our current understanding of physics might break down. Basic physics is REALLY REALLY well tested. The chances that some new experimental configuration will expose new physics, without involving extreme energy concentrations or extremely large or tiny spatial dimensions, is so near to zero as to be negligible.
How do we know it doesn't work? Because it violates conservation of momentum, without involving any of the extreme conditions where our current understanding of physics might break down. Basic physics is REALLY REALLY well tested. The chances that some new experimental configuration will expose new physics, without involving extreme energy concentrations or extremely large or tiny spatial dimensions, is so near to zero as to be negligible.